Ram material is aluminum rods instead of ingots to ensure the high quality and quick delivery. The alloy number can be 6063/6060, 6005, 6061 with treatment of T5 or T6. The production procedure is heating, extruding, cooling, aging, sandblasting, anodizing, cutting (including machining) and then packing. No recycled ingot used.. The surface treatment can be mill finish, anodizing, powder coating, electrophoresis, wooden print... Square tube can be used widely at any field with beautiful surface performance and accurate dimensions